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Posting a snap of herself and Wilmer kissing, Demi wrote: "I wish I could put into words how grateful I am for this man right here. But my love has grown to a level that words could never possibly express how much this man completes me. He's loved me the way I never thought I deserved to be loved and with this day marking my 3rd year sober... After sharing my ups, putting up with my downs and supporting my recovery... he still never takes credit and I want the world to know how incredible his soul is. I really wouldn't be alive today without him. I love you Wilmer."

The That 70s Show star had already paid credit to his girlfriend for putting her demons behind her.

"It is now 3 years since you said: I am more important then any past, demon, disorder or addiction.." he wrote. "Where you decided that YOUR life was worth living while loving yourself.. And I'm sure glad you did... I knew then the woman you've become now.. I am proud and honor to be front row to see the world you are about to change. I love you Demi."